Borehole Fingerprinting: Vertical Strain, Firn Compaction, and Firn Depth-Age Scales

0087521沃丁顿该奖项支持一个为期两年的项目，以开发一种新的方法来测量垂直应变率在极地积雪。 垂直应变率的测量是很重要的，因为它们可以帮助理解的动力学的积雪压实，一个关键因素，在确定冰年龄/气体年龄的差异估计冰芯。 垂直应变率测量也确定冰平流钻孔古测温模型，最重要的是，可以用来定年的冰芯的浅部在化学测年或计数的模糊性阻碍了传统方法测年。在这个项目中，视频记录工具将被用来创建一个独特的“光学指纹”的变化，在光学特性的积雪与深度，并跟踪移动和变形的特点，这个指纹。 在南极洲的Siple Dome，使用简易测井系统进行的初步工作显示，当工具向上或向下移动时，会出现一系列光学亮区和暗区。 钻孔指纹有可能改善测量的垂直应变在积雪孔。 该项目代表了一个独特的机会，与现有的现场项目接口，其中钻孔垂直应变率项目已经在进行中。 将支持一名研究生作为博士学位的一部分进行该项目的工作。极地积雪的气候和物理过程的论文。

0087521WaddingtonThis award supports a two year project to develop a new method for measuring vertical strain rates in polar firn. Vertical strain rate measurements in the firn are important because they can aid in the understanding of the dynamics of firn compaction, a key factor in determining ice age/gas age difference estimates for ice cores. Vertical strain rate measurements also determine ice advection for borehole paleothermometry models, and most importantly can be used to date the shallow sections of ice cores where ambiguities in chemical dating or counting of annual layers hinder dating by traditional methods. In this project a video logging tool will be used to create a unique "optical fingerprint" of variations in the optical properties of the firn with depth, and track the movement and deformation of the features of this fingerprint. Preliminary work at Siple Dome, Antarctica using an improvised logging system shows a series of optically bright and dark zones as the tool transits up or down the hole. Borehole fingerprinting has the potential to improve measurements of vertical strain in firn holes. This project represents a unique opportunity to interface with an existing field program where a borehole vertical strain rate project is already underway. A graduate student will be supported to conduct the work on this project as part of a PhD. dissertation on climate and physical processes in polar firn.